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6689143 = 17393479
BaseRepresentation
bin11001100001000101110111
3110120211210001
4121201011313
53203023033
6355212131
7110566606
oct31410567
913524701
106689143
11385971a
1222a7047
131502896
14c61a3d
158c1e7d
hex661177

6689143 has 4 divisors (see below), whose sum is σ = 7082640. Its totient is φ = 6295648.

The previous prime is 6689141. The next prime is 6689147. The reversal of 6689143 is 3419866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3419866 = 21709933.

It is a cyclic number.

It is not a de Polignac number, because 6689143 - 21 = 6689141 is a prime.

It is a Duffinian number.

6689143 is a lucky number.

It is a zygodrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196723 + ... + 196756.

It is an arithmetic number, because the mean of its divisors is an integer number (1770660).

Almost surely, 26689143 is an apocalyptic number.

6689143 is a deficient number, since it is larger than the sum of its proper divisors (393497).

6689143 is a wasteful number, since it uses less digits than its factorization.

6689143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393496.

The product of its digits is 31104, while the sum is 37.

The square root of 6689143 is about 2586.3377582984. The cubic root of 6689143 is about 188.4184789162.

The spelling of 6689143 in words is "six million, six hundred eighty-nine thousand, one hundred forty-three".

Divisors: 1 17 393479 6689143